Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss) income		$ 6,834	$ (46,768)	$ 48,043	$ 1,275	$ 8,109	$ (410)		$ (36,764)		$ 10,803
Less: Net income applicable to contingently issuable shares							909		0		0
Net (loss) income on which diluted earnings per share is calculated							$ (1,319)		$ (36,764)		$ 10,803
Basic weighted average outstanding shares of common stock (in shares)	[1]						83,045,000		61,848,000		57,621,000
Dilutive effect of stock-based awards for common stock (in shares)							0		0		1,605,000
Dilutive effect of contingent earnout shares before conversion (in shares)							68,000		0		0
Dilutive effect of stockholder notes receivable for common stock (in shares)							0		0		407,000
Dilutive effect of warrants for common stock (in shares)							0		0		2,549,000
Diluted weighted average outstanding shares of common stock (in shares)	[1]						83,113,000		61,848,000		62,182,000
Earnings per share - basic (in usd per share)		$ 0.08	$ (0.60)	$ 0.62	$ 0.02	$ 0.10	$ 0	[1]	$ (0.59)	[1]	$ 0.19	[1]
Earnings per share - diluted (in usd per share)		$ 0.08	$ (0.60)	$ 0.60	$ 0.01	$ 0.09	$ (0.02)	[1]	$ (0.59)	[1]	$ 0.17	[1]
Anti-dilutive options excluded from calculation of diluted EPS (in shares)							7,224,134		28,561,724		439,167

[1] Per share and share amounts for 2018 have been retroactively restated to give effect to the reverse recapitalization that is discussed in Note 3.